Why would Marc Jacobs personally invite K. Fed to his impossible-to-get-into show tomorrow night? Because he's the cleverest fame-whore of them all, that's why! With Britney making more headlines than ever but, um, unavailable for public appearances at the moment, Marc knows something the other designers don't: the sheer presence of Kevin Federline will catapault his name into the headlines during what has been an unusually slow Fashion Week. The kicker? The appearance happens on the same day as, you guessed it, Britney 's bombshell profile in Rolling Stone hits newsstands!